Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8537b12dc23856…

MALICIOUS

PDF

76.0 KB Created: 2021-04-21 11:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 032da804f75b252d0047684593d11f83 SHA-1: 23dd299d737ce44ffd6172411bdf7587ae86525a SHA-256: 7e8537b12dc23856b0521552e43310b8ef8edd919400cd6a7930d94a196cf2f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting it is part of a phishing or malware distribution campaign. The document body, though truncated, appears to be a lure related to 'musical instruments frequency range chart', which is likely a pretext to drive users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/strik?utm_term=musical+instruments+frequency+range+chart PDF link annotation
    • http://liwitesuzemumex.sportsontheweb.net/34201581699.pdfIn PDF document text
    • http://albl.ru/auto_call_recorder_apps_for_androidy5kru.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/frSucYe/xareduxiregake.pdfIn PDF document text
    • http://xekedibu.iblogger.org/bollywood_full_hd_song_website.pdfIn PDF document text
    • https://cdn.sqhk.co/jumosanex/zifYdhd/26948117187.pdfIn PDF document text
    • http://ru-1.casa/accp_vte_guidelines_20124ipwa.pdfIn PDF document text
    • http://pajodumu.22web.org/21092769859.pdfIn PDF document text
    • http://koponegigat.medianewsonline.com/casio_fx-9860gii_sd_price_philippines.pdfIn PDF document text
    • http://spencermcman.us/best_notsobot_commands0fay0.pdfIn PDF document text
    • http://present-mag.ru/gafekojoxqpez.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/4333776591lewao.pdfIn PDF document text
    • http://pinezov.iblogger.org/gen_math_book_grade_11.pdfIn PDF document text
    • http://deromgroup.com/why_is_music_important_for_toddlersauu7i.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/84930096524.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/iPibkJf/zuzodepanidefowuforog.pdfIn PDF document text
    • http://trastenmyqort.online/how_to_go_on_a_mental_diet7dpvp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wovubixagoxix.rf.gd/sofumeje.pdfIn PDF document text
    • http://fevumuweli.rf.gd/difference_between_bacterial_and_viral_chest_infections.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/nowidonamilikuxa.pdfIn PDF document text
    • http://revogip.epizy.com/buginapodiwelaf.pdfIn PDF document text
    • http://sofibimibojas.myartsonline.com/internal_auditing_assurance__advisory_services_third_edition.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 5528 bytes
SHA-256: 74aa7ceee7a0713a8b717538c3ee9788ed0781d221ef6085392008026fde5372
font_01_sfnt_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 10772 bytes
SHA-256: b6ff1ba5bf54d5cf3ae9b4ecde37bbdb4c12746a22c3b4776da6de3cd77dfa93

Open this report in the interactive analyzer, or submit your own file for analysis.